Low-energy properties of the Kondo lattice model
2011 | journal article. A publication with affiliation to the University of Göttingen.
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- Authors
- Bodensiek, Oliver; Zitko, Rok; Peters, Robert; Pruschke, T.
- Abstract
- We study the zero-temperature properties of the Kondo lattice model within the dynamical mean-field theory. As an impurity solver we use the numerical renormalization group. We present results for the paramagnetic case showing the anticipated heavy-fermion physics, including direct evidence for the appearance of a large Fermi surface for antiferromagnetic exchange interaction. Allowing for the formation of a Neel state, we observe at finite doping an antiferromagnetic metal below a critical exchange interaction, which shows a crossover from a local moment antiferromagnet with a small Fermi surface for weak exchange coupling to a heavy-fermion antiferromagnet with a large Fermi surface for increasing exchange. Including lattice degrees of freedom via an additional Holstein term we observe a significant suppression of the Kondo effect, leading to a strongly reduced low-energy scale. For too large electron-phonon coupling we find a complete collapse of the heavy Fermi liquid and the formation of polarons.
- Issue Date
- 2011
- Status
- published
- Publisher
- Iop Publishing Ltd
- Journal
- Journal of Physics Condensed Matter
- ISSN
- 0953-8984